Grate.



No. 896,692. PATENTED AUG. 18, 1908. I. G. GROWDES.

GRATE.

APPLICATION. FILED AUG. 5. 1907} 2 SHEET-SHEET 1.

UNITED srA'rEs PATENT orrion.

JACKSON G. OBOWDES, OF BOSTON, MASSACHUSETTS, ASSIG-NOR TO CHARLES RUGG, OF

BROOKLINE, MASSAGHULQ'ETTB.

Specification of Letters Patent.

Patented Aug. 18, 1908.

Application filed August 5, 1907. Serial No. 887,104.

To all whom it may concern:

Be it known that I, JAcKsoN G. CRownEs, of Boston, in. the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Grates, of which the following is a specification.

My invention relates to new and useful improvements in grates and is especially ada )ted to burn fine screenings or other fuel.

The main object of my invention is to provide a hollow grate through which air may be forced under pressure to supply the necessary oxygen to insure perfect combustion.

Another object of my invention is to prevent the air from entering the ash 1pit and compel it to pass up through the fue on the grate bars. In the accompanying drawings which illustrate a construction embodying my invention, Figure 1 is an isometric view partly in section showing a portion of the grate with the Walls of the furnace broken away; Fig. 2 is a side view of the lower portion of one of the grate bars broken in the center; Fig. is a plan view of same" Fig. 4 is an end view of the upper portions. one of the grate bars; Fig. 5 1s a lan view of the same; Fig. 6 is a side view 0 the same Fig. 7 is a vertical central section through the upper portion of the grate bar; Fi 8 is a perspective view partly in section of die lower part of the upper portion of a grate bar; Fig. 9 is vertical sectional view taken on line 9-.- i Fig. 2 looking in the direction of the arrow.

Like lettrrs of referencerefer' to like parts throughout the several views.

A re resents a furnace having the usual side we ls A, A and front A provided with the usual ash it and wall A, the other wall being entirely roken away for clearness.

B represents a pipe for forced drafts connecting with the air duct B which is provided with bearings B for the'hollow journals C of the lower ortions or bars D of the grate. The journa C of each bar-is hollow and receives forced draft from slots C which draft asses into the lower portion B of each grate arand up and out through the upper portion or grate sections hereinafter. described, and inte the fuel for the combustion thereof.' The opposite end of each grate bar is provided'with a journal E which its.

into the usual bearing inthe side wall of the furnace with. a flange E rest ng against said bearing. The lower-portion D of each grate bar has a flange C which rests against the air duct B as shown, andbeyond said flange are located a number of hollow chambers or sockets D; each of which is open at the to and has an opening D in its bottom. Each chamber is provided with downwardly in clined' sides")? adapted to hold the upper portions of each grate bar in place and with .1 which the inclined sides d d" contact forming 'a tapering jointwhen the upper portion F of each grate bar is placed in position on the lower portion.

The grate is assembled by placing in each hollow chamber D the upper ortion F with shoulders d resting upon the at surfaces D of each chamber 1.) and with the duct F in alinement with the duct C through which forced draft enters through slot C registering with slot C in the bearing B of the duct B. The duct F also is in alinement with passages D connecting the hollow chambers D from end to end. When each upper portion F is placed in its chamber 1) the lug M of each upper portion F passes through the opening D the lug M is provided with two inwardly-turned flanges M on which rests the sliding dam or N provided with holes 0 and when it is esired to clean the grate the sliding damper-N is moved to bring the holes G into alinement with the ports P of each upper portion F so that the grate may be cleaned by the forced draft into the ash pit and the damper is then moved back to close the ports P and thereby prevent the forced draft from entering the ash pit. Any suitable device may be used for operating the damper. These dampers also act as keys to hold the upper portions F in place.

Each upper portion. F of the grate surfaces G is rovided with openings K through which the time air passes into the fuel. Between these surfaces are s aces L through which natural'dr aft from t e ash pit may pass up into the fuel. for combustion. The lower portion D of each rate liar may be of any desired length and may be provided with any number of chambers D into which fits a corres onding number of upper portions F.

he air under pressure entering the air duct B asses through the slots 0 and G into the (not C and from there into the duct F throughout the length of the grate, as the duct F in each upper portion. F is connected with the other ducts Fby passages l) and theair under pressure passes from the ducts BEST AVAILABLE COPY F into the chamber l 'of eachupper portion i and'out through openingsK-m the up r surfaces of each, upperfportion F to the lid t supply the necessary oxygen for proper seen that-the forced draft must all pass up through the' grate intothe fuel and cannot own into the ash pit. In addition,

naturalfdraft may be employed and passes each lower portion 'D- is pivotally connected; grates may belocked stationary if. de'-,1

The

iinprosred grate as adapted for usewith forced draft, yet it will be; understood that it may bequs ed with natural draft tov advan-' p ta s.

vention and-set forth a construction embody the same, whatl claim as new and desire v to secure by Letters Patent of the United Statesis-Ij Y as L' ln a grate, a :hollow grate-bar an airsupply pipe communicating with said grate-l ear, transverse partitions. having apertures through the samedividing said grate-bar into N aseries of communicating sockets or cham--- hers; and grate-sections seatedin' said sock; ets having ductsiegis'tering, with the 'apere titres iii-said partitions and provided withriorations in their upper faces" leading.

mm said ductsL, v

grate-arr. I p 3.: Ina-grate, a hollow-grate-barhaving a series of openings in -its bottom, an airsupply pipecommunicating with said grate-bar,

grate-sections seatedin said grate-bar haveoinbustion'g By this construction it will be grateings in the bottorn of the glfate bar. divi" 'n'g' v Although I have particularly described-my v v I I grate-sections extendin throug said open- I Having thus describedthe nature of my iny p j y 5. In a grate, a rotatable.;.hollow grate bar having a series of openings in its bottom, a

In a grate, a hollow grate barhaving,

iilg duets i th-th paa erna'gt the grateeba'r and provided-withperforations in their upper'fa'c'es leadin from said ductsand said grate-section's alsojiaving' .p'o'rts leading from said ducts to the ash'-p1t, lugs on. theyfl'so lower arts of fsai'd; grate-.sectionsjextending v throu fsaid epel ins' l. th bo t Q th ar, and a; damper; "controlling said.

'- 4:. In a grate; a hollow grate sbar havinga supply pipe communicatin WithS aid grater-- ar, transverse partitions avi'ng apertures-x through the same located' 'be'tween said 0' en- 70.. the latter into a series-pf communicating- 7 sockets o rchambers, grate sections seated-in said sjookets jhavin Y-.duets.. registering the'apert'ures inisai partitionsand'.-providedwith perforations in t eir upper faces leading '7 5. from said ducts and said-grate-sections also having ports leading froniwsajdduc-ts-to the ash pit; andglugs".on-thedower arts. of said ings in the bottomof s'a1d grate-bar. 8d

ing for said journal, an air-supply pipe I pom-.1. 815" .municatingiwith said journal, transverse par v titions having apertures through; the same, located between said openings in the bottom: r

of the grate=bar dividing thelatter'i'ntoa se-j ries of communicatingsockets-or chambers", 9o

grat'e slections spaced'apart to form passages through the grate seatedin said sockets hav ing ductsregistering. with the apertures in said partitions andprovided with perfora-j tion's intheir upper-faces leading from'sai'd' p'orts'leading'from saidducts tothe ash-pit,

lugs: on'the lower-parts of said grate-sections lexte'nding throughtsaid -ope nings in the bot-' 'tom ofthe grate-bar;- a guide-way on the 'un- 10c der side of said lugs; and a dam er movable 'in said guide-way to'con'trol s'ai ports.v

I In testimony whereofl have .sig'nedmy. I name to this specification in the pr'e'sence of two subscribing witnesses, 'this 24th day of 105} July A. D. 1907. v H

- JACKSON. GQCROWDES Witnesses:

H. L. MEssER, PERCY A; BR'IDGHAM.

4 1 1.- series of opemngs -in-- its -bottom, -an i'air- 95 j. ductsand'said grate-sections j'also having- 

